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import zlib
import io
from socket import timeout as SocketTimeout
from ._collections import HTTPHeaderDict
from .exceptions import ProtocolError, DecodeError, ReadTimeoutError
from .packages.six import string_types as basestring, binary_type, PY3
from .connection import HTTPException, BaseSSLError
from .util.response import is_fp_closed
class DeflateDecoder(object):
def __init__(self):
self._first_try = True
self._data = binary_type()
self._obj = zlib.decompressobj()
def __getattr__(self, name):
return getattr(self._obj, name)
def decompress(self, data):
if not data:
return data
if not self._first_try:
return self._obj.decompress(data)
self._data += data
try:
return self._obj.decompress(data)
except zlib.error:
self._first_try = False
self._obj = zlib.decompressobj(-zlib.MAX_WBITS)
try:
return self.decompress(self._data)
finally:
self._data = None
class GzipDecoder(object):
def __init__(self):
self._obj = zlib.decompressobj(16 + zlib.MAX_WBITS)
def __getattr__(self, name):
return getattr(self._obj, name)
def decompress(self, data):
if not data:
return data
return self._obj.decompress(data)
def _get_decoder(mode):
if mode == 'gzip':
return GzipDecoder()
return DeflateDecoder()
class HTTPResponse(io.IOBase):
"""
HTTP Response container.
Backwards-compatible to httplib's HTTPResponse but the response
``body`` is
loaded and decoded on-demand when the ``data`` property is accessed.
This
class is also compatible with the Python standard library's
:mod:`io`
module, and can hence be treated as a readable object in the context of
that
framework.
Extra parameters for behaviour not present in httplib.HTTPResponse:
:param preload_content:
If True, the response's body will be preloaded during
construction.
:param decode_content:
If True, attempts to decode specific content-encoding's based
on headers
(like 'gzip' and 'deflate') will be skipped and
raw data will be used
instead.
:param original_response:
When this HTTPResponse wrapper is generated from an
httplib.HTTPResponse
object, it's convenient to include the original for debug
purposes. It's
otherwise unused.
"""
CONTENT_DECODERS = ['gzip', 'deflate']
REDIRECT_STATUSES = [301, 302, 303, 307, 308]
def __init__(self, body='', headers=None, status=0,
version=0, reason=None,
strict=0, preload_content=True, decode_content=True,
original_response=None, pool=None, connection=None):
if isinstance(headers, HTTPHeaderDict):
self.headers = headers
else:
self.headers = HTTPHeaderDict(headers)
self.status = status
self.version = version
self.reason = reason
self.strict = strict
self.decode_content = decode_content
self._decoder = None
self._body = None
self._fp = None
self._original_response = original_response
self._fp_bytes_read = 0
if body and isinstance(body, (basestring, binary_type)):
self._body = body
self._pool = pool
self._connection = connection
if hasattr(body, 'read'):
self._fp = body
if preload_content and not self._body:
self._body = self.read(decode_content=decode_content)
def get_redirect_location(self):
"""
Should we redirect and where to?
:returns: Truthy redirect location string if we got a redirect
status
code and valid location. ``None`` if redirect status and no
location. ``False`` if not a redirect status code.
"""
if self.status in self.REDIRECT_STATUSES:
return self.headers.get('location')
return False
def release_conn(self):
if not self._pool or not self._connection:
return
self._pool._put_conn(self._connection)
self._connection = None
@property
def data(self):
# For backwords-compat with earlier urllib3 0.4 and earlier.
if self._body:
return self._body
if self._fp:
return self.read(cache_content=True)
def tell(self):
"""
Obtain the number of bytes pulled over the wire so far. May differ
from
the amount of content returned by :meth:``HTTPResponse.read`` if
bytes
are encoded on the wire (e.g, compressed).
"""
return self._fp_bytes_read
def read(self, amt=None, decode_content=None, cache_content=False):
"""
Similar to :meth:`httplib.HTTPResponse.read`, but with two
additional
parameters: ``decode_content`` and ``cache_content``.
:param amt:
How much of the content to read. If specified, caching is
skipped
because it doesn't make sense to cache partial content as
the full
response.
:param decode_content:
If True, will attempt to decode the body based on the
'content-encoding' header.
:param cache_content:
If True, will save the returned data such that the same result
is
returned despite of the state of the underlying file object.
This
is useful if you want the ``.data`` property to continue
working
after having ``.read()`` the file object. (Overridden if
``amt`` is
set.)
"""
# Note: content-encoding value should be case-insensitive, per RFC
7230
# Section 3.2
content_encoding = self.headers.get('content-encoding',
'').lower()
if self._decoder is None:
if content_encoding in self.CONTENT_DECODERS:
self._decoder = _get_decoder(content_encoding)
if decode_content is None:
decode_content = self.decode_content
if self._fp is None:
return
flush_decoder = False
try:
try:
if amt is None:
# cStringIO doesn't like amt=None
data = self._fp.read()
flush_decoder = True
else:
cache_content = False
data = self._fp.read(amt)
if amt != 0 and not data: # Platform-specific: Buggy
versions of Python.
# Close the connection when no data is returned
#
# This is redundant to what httplib/http.client
_should_
# already do. However, versions of python released
before
# December 15, 2012
(http://bugs.python.org/issue16298) do
# not properly close the connection in all cases.
There is
# no harm in redundantly calling close.
self._fp.close()
flush_decoder = True
except SocketTimeout:
# FIXME: Ideally we'd like to include the url in the
ReadTimeoutError but
# there is yet no clean way to get at it from this context.
raise ReadTimeoutError(self._pool, None, 'Read timed
out.')
except BaseSSLError as e:
# FIXME: Is there a better way to differentiate between
SSLErrors?
if 'read operation timed out' not in str(e): #
Defensive:
# This shouldn't happen but just in case
we're missing an edge
# case, let's avoid swallowing SSL errors.
raise
raise ReadTimeoutError(self._pool, None, 'Read timed
out.')
except HTTPException as e:
# This includes IncompleteRead.
raise ProtocolError('Connection broken: %r' % e,
e)
self._fp_bytes_read += len(data)
try:
if decode_content and self._decoder:
data = self._decoder.decompress(data)
except (IOError, zlib.error) as e:
raise DecodeError(
"Received response with content-encoding: %s, but
"
"failed to decode it." % content_encoding, e)
if flush_decoder and decode_content and self._decoder:
buf = self._decoder.decompress(binary_type())
data += buf + self._decoder.flush()
if cache_content:
self._body = data
return data
finally:
if self._original_response and
self._original_response.isclosed():
self.release_conn()
def stream(self, amt=2**16, decode_content=None):
"""
A generator wrapper for the read() method. A call will block until
``amt`` bytes have been read from the connection or until the
connection is closed.
:param amt:
How much of the content to read. The generator will return up
to
much data per iteration, but may return less. This is
particularly
likely when using compressed data. However, the empty string
will
never be returned.
:param decode_content:
If True, will attempt to decode the body based on the
'content-encoding' header.
"""
while not is_fp_closed(self._fp):
data = self.read(amt=amt, decode_content=decode_content)
if data:
yield data
@classmethod
def from_httplib(ResponseCls, r, **response_kw):
"""
Given an :class:`httplib.HTTPResponse` instance ``r``, return a
corresponding :class:`urllib3.response.HTTPResponse` object.
Remaining parameters are passed to the HTTPResponse constructor,
along
with ``original_response=r``.
"""
headers = r.msg
if not isinstance(headers, HTTPHeaderDict):
if PY3: # Python 3
headers = HTTPHeaderDict(headers.items())
else: # Python 2
headers = HTTPHeaderDict.from_httplib(headers)
# HTTPResponse objects in Python 3 don't have a .strict
attribute
strict = getattr(r, 'strict', 0)
resp = ResponseCls(body=r,
headers=headers,
status=r.status,
version=r.version,
reason=r.reason,
strict=strict,
original_response=r,
**response_kw)
return resp
# Backwards-compatibility methods for httplib.HTTPResponse
def getheaders(self):
return self.headers
def getheader(self, name, default=None):
return self.headers.get(name, default)
# Overrides from io.IOBase
def close(self):
if not self.closed:
self._fp.close()
@property
def closed(self):
if self._fp is None:
return True
elif hasattr(self._fp, 'closed'):
return self._fp.closed
elif hasattr(self._fp, 'isclosed'): # Python 2
return self._fp.isclosed()
else:
return True
def fileno(self):
if self._fp is None:
raise IOError("HTTPResponse has no file to get a fileno
from")
elif hasattr(self._fp, "fileno"):
return self._fp.fileno()
else:
raise IOError("The file-like object this HTTPResponse is
wrapped "
"around has no file descriptor")
def flush(self):
if self._fp is not None and hasattr(self._fp, 'flush'):
return self._fp.flush()
def readable(self):
# This method is required for `io` module compatibility.
return True
def readinto(self, b):
# This method is required for `io` module compatibility.
temp = self.read(len(b))
if len(temp) == 0:
return 0
else:
b[:len(temp)] = temp
return len(temp)